/*
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
package org.evosuite.runtime.thread;

public class KillSwitchHandler implements KillSwitch {

    private static final KillSwitchHandler singleton = new KillSwitchHandler();

    private volatile boolean kill;

    /**
     * singleton constructor
     */
    private KillSwitchHandler() {
        kill = false;
    }

    public static KillSwitchHandler getInstance() {
        return singleton;
    }

    @Override
    public void setKillSwitch(boolean kill) {
        this.kill = kill;
    }

    /**
     * Throw an exception if kill switch is on
     *
     * @throws RuntimeException
     */
    public void checkTimeout() throws RuntimeException {
        if (kill) {
            throw new RuntimeException("Kill switch");
        }
    }

    /**
     * Wrapper around {@link KillSwitchHandler#checkTimeout()} to simplify instrumentation
     *
     * @throws RuntimeException
     */
    public static void killIfTimeout() throws RuntimeException {
        getInstance().checkTimeout();
    }
}
